Quartz: Scheduler: standby(): Temporarily halt the scheduler

'org.quartz.Scheduler' interface provides standby method, it is used to temporarily halt the scheduler from firing triggers.

Example

Scheduler scheduler = schedulerFactory.getScheduler();

scheduler.standby();

Call the start() method, to bring the scheduler out of stand-by mode.

Find the below working example.

HelloJob.java

package com.sample.jobs;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;

public class HelloJob implements Job {
 public void execute(JobExecutionContext jec) throws JobExecutionException {
  String schedulerName = null;
  String schedulerInstanceId = null;

  String userName = null;
  String token = null;

  try {

   Scheduler scheduler = jec.getScheduler();

   schedulerName = scheduler.getSchedulerName();
   schedulerInstanceId = scheduler.getSchedulerInstanceId();

   userName = (String) scheduler.getContext().get("userName");
   token = (String) scheduler.getContext().get("token");

  } catch (SchedulerException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  System.out.println("**************************************************");
  System.out.println("Hello!!!");
  System.out.println("Job is triggered by scheduler : " + schedulerName);
  System.out.println("Scheduler instance id : " + schedulerInstanceId);
  System.out.println("User name : " + userName);
  System.out.println("Token : " + token);
  System.out.println("**************************************************");
 }
}

QuartzSchedulerEx.java

package com.sample.app;

import java.util.Date;

import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.impl.JobDetailImpl;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.triggers.SimpleTriggerImpl;

import com.sample.jobs.HelloJob;

public class QuartzSchedulerEx {
 public static void main(String args[]) throws SchedulerException, InterruptedException {

  // Initiate a Schedule Factory
  SchedulerFactory schedulerFactory = new StdSchedulerFactory();

  // Retrieve a scheduler from schedule factory
  Scheduler scheduler = schedulerFactory.getScheduler();

  scheduler.getContext().put("userName", "Krishna");
  scheduler.getContext().put("token", "token1234");

  // Delay the execution of scheduler for 5 seconds
  scheduler.start();

  JobDetailImpl helloJobDetails = new JobDetailImpl();
  helloJobDetails.setName("Hello Job");
  helloJobDetails.setJobClass(HelloJob.class);

  // Creating schedule time with trigger
  SimpleTriggerImpl trigger1 = new SimpleTriggerImpl();
  trigger1.setStartTime(new Date(System.currentTimeMillis() + 500));
  trigger1.setRepeatCount(-1);
  trigger1.setRepeatInterval(3000);
  trigger1.setName("First Trigger");
  trigger1.setPriority(10); // Setting trigger 1 priority to 10

  scheduler.scheduleJob(helloJobDetails, trigger1);

  System.out.println("Scheduler is going to halt for 5 seconds....");
  scheduler.standby();
  Thread.sleep(5000);
  scheduler.start();
 }
}

Previous                                                    Next                                                    Home